The Robert Charles Plain Shank Counterbore is a high-performance cutting tool designed for clean, precise counterbores in metal parts. Built for precision engineering, automotive applications, and everyday workshop use, it delivers durable performance with every pass.

• Material: M35-HSS-E with 5% cobalt for enhanced heat resistance and extended wear life, maintaining sharpness under demanding cutting conditions.
• Plain Shank: Easy fitment in standard tool holders, enabling quick changes and stable, chatter-free machining.
• Pilot Size: 0.452" pilot ensures accurate alignment and consistent counterbore depth across multiple workpieces.
• Cap Screw Size: Designed for 7/16" cap screw applications, providing secure clamping in the setup.
• Cutting Geometry: Precision-ground edges yield clean, square counterbores with minimal burrs and excellent surface finish.
• Applications: Ideal for precision components, automotive housings, and general fabrication where durability and repeatable results matter.

With this counterbore, you gain repeatable depth control, faster setup times, and longer tool life in tough materials. The cobalt-enhanced high-speed steel maintains a sharp edge at higher temperatures, reducing rework and delivering smooth counterbored faces. Its plain shank fits a wide range of tool holders, making it a dependable choice for production runs and one-off projects alike.